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US 8,067,492 B2Granted
Biodegradable hot-melt adhesive composition
AssigneeBostik SA
InventorChristophe Robert
Life of this patent
Estimating the term…
Abstract
The invention relates to biodegradable hot-melt adhesive compositions, preferably without residual tackiness at room temperature and having a biodegradability, as measured by the released carbon-dioxide analysis method pursuant to Standard EN ISO 14855, that is higher than 55% , preferably higher than 60% , and preferably higher than 90% , and to the use thereof. This percentage is given by reference with the cellulose biodegradability measurement, which amounts to 100% in the same conditions.
Claims20
A biodegradable hot-melt adhesive composition, comprising
- (A) from 30% to 90% by weight with respect to the total weight of the adhesive composition, of (A1) a polycaprolactone homopolymer, (A2) polyesters resulting from the condensation of a carboxylic diacid of formula R1—[COOH]2 in which R1 represents a linear or cyclic C2-C30 hydrocarbon group, saturated or unsaturated, mono or polyhydroxylated with a diol of formula R2[OH]2 in which R2 represents a linear, cyclic or polycyclic C2-C32 hydrocarbon group, saturated, unsaturated or polyunsaturated, or mono or polyhydroxylated, or (A3) polycaprolactone (A1) and polyester (A2) copolymers;
- (B) from 10% to 50% by weight with respect to the total weight of the adhesive composition, an adhesion-promoting agent or tackifier having an average molar mass by weight Mw between 300 and 5000, which agent or tackifier is:
- (i) rosins of natural origin or modified;
- (ii) terpene resins resulting from the polymerisation of terpene hydrocarbons in the presence of Friedel-Crafts catalysts, optionally modified by the action of phenols;
- (iii) copolymers based on natural terpenes;
- (C) from 10% to 30% by weight with respect to the total weight of the adhesive composition of a stiffening agent represented by a wax having a melting point within the range of 40° C. to 150° C.,
- (D) 0% to 20% by weight with respect to the total weight of the adhesive composition of one or more additives that are stabilizers, antioxidants, anti-blocking agents, pigments, colorants or fillers.
4 more elements
Dependencies are inferred from the claim text.